Why Are Skyscrapers Designed to Move in Strong Winds?
Stand near the top of a very tall skyscraper on a windy day and something surprising can happen.
The building may move.
Not enough to look as if it is falling.
Not enough to damage the structure.
But enough that highly sensitive instruments—and sometimes the people inside—can detect it.
This skyscraper sway is not necessarily a defect.
It is intentional.
Engineers know that wind places enormous sideways forces on tall buildings. Trying to make a 500-meter tower behave like a completely immovable block would require enormous structural stiffness and huge quantities of material.
Instead, skyscrapers are designed with carefully controlled flexibility.
They bend slightly.
They vibrate.
They absorb energy.
Then they return toward their original position.
The challenge is not eliminating skyscraper sway completely. It is keeping movement within carefully calculated limits so the structure remains safe, façades remain intact, elevators continue operating properly and occupants remain comfortable.
The American Society of Civil Engineers notes that tall and slender buildings are particularly sensitive to wind because wind speed generally increases with height and because flexible structures respond dynamically to gusts. ASCE’s guidance on designing tall buildings for wind treats these effects as a fundamental part of modern skyscraper engineering.
This is why some of the world’s tallest buildings contain enormous concrete cores, aerodynamic shapes, sophisticated damping systems and even giant moving weights.
Taipei 101, for example, contains a 728-ton tuned mass damper near the top of the tower.
Burj Khalifa changes shape repeatedly as it rises specifically to disrupt organized wind forces.
Shanghai Tower uses both its twisting form and a damping system to reduce motion.
Modern skyscrapers do not defeat the wind by refusing to move.
They survive it by moving intelligently.
Skyscraper Sway at a Glance
| Engineering Question | What Happens |
|---|---|
| Do skyscrapers actually move? | Yes |
| Is skyscraper sway intentional? | Yes, within design limits |
| Why not make towers completely rigid? | It would be inefficient, heavy and extremely difficult |
| What causes movement? | Wind pressure, gusts and vortex shedding |
| Is movement normally dangerous? | No, when within design limits |
| What often limits design first? | Occupant comfort rather than structural strength |
| How is sway reduced? | Structural stiffness, aerodynamic shaping and damping |
| What is a tuned mass damper? | A heavy moving mass that counteracts tower motion |
| Famous example | Taipei 101’s 728-ton damper |
| Can building shape reduce wind forces? | Yes—tapering, setbacks, rounded corners and twisting forms can disrupt vortices |
Understanding skyscraper sway starts with understanding what wind actually does to a building.
Wind Becomes More Important as Buildings Get Taller
At street level, the wind may feel moderate.
Hundreds of meters above you, conditions can be very different.
Buildings near the ground are surrounded by:
other structures,
trees,
terrain,
roads,
and surface friction.
These obstacles slow and disrupt moving air.
Higher above the surface, wind generally becomes stronger.
NIST research on the atmospheric boundary layer notes that mean wind speed increases with height over the elevations relevant to tall-building design. NIST’s tall-building wind research examines why this vertical wind profile matters when designing very tall structures.
That creates a simple problem.
The taller the skyscraper becomes, the more of it reaches into faster-moving air.
At the same time, tall towers tend to become increasingly slender relative to their height.
A 10-story building may behave largely like a stiff block.
A 100-story building behaves much more like a gigantic vertical cantilever.
Push the top and it bends.
This flexibility is why skyscraper sway becomes a major design issue for supertall buildings.
A Skyscraper Behaves More Like a Tree Than a Stone Wall
Imagine two objects during a storm.
One is a perfectly rigid stone wall.
The other is a tall tree.
The wall tries to resist almost all movement.
The tree bends.
Its trunk flexes.
Branches move.
The whole structure changes position temporarily and then returns.
Skyscrapers are obviously not trees, but the analogy helps.
A tall building that flexes slightly can redistribute wind-induced forces through its structure.
That movement stores and releases elastic energy.
A structure designed to remain theoretically motionless under every possible wind would require extraordinary stiffness.
That means larger:
columns,
walls,
cores,
braces,
foundations,
and quantities of concrete or steel.
Some stiffness is essential.
Too much movement would damage the building.
But zero movement is neither realistic nor necessary.
Structural engineering is about controlling deformation, not pretending forces do not exist.
Modern reinforced concrete—one of the technologies descended from a much older material discussed in The News Ink’s guide to ancient inventions we still use today—makes today’s extremely tall towers possible precisely because engineers can combine stiffness, strength and controlled deformation.
What Actually Pushes a Skyscraper?
Wind does not apply one smooth, constant force.
It is turbulent.
Speed changes.
Direction changes.
Gusts arrive.
Air separates around building corners.
Pressure on one side differs from pressure on another.
The result can produce three main types of motion.
Along-Wind Motion
This is movement primarily in the same direction the wind is blowing.
Gusts increase and decrease pressure on the front and rear of the tower.
That changing force causes movement.
Across-Wind Motion
A tower can also move sideways relative to the incoming wind.
This often involves vortex shedding, one of the most important phenomena in skyscraper sway.
Torsional Motion
The building can twist.
If aerodynamic forces do not pass exactly through the tower’s center of stiffness, they can produce rotational motion.
NIST research specifically examines wind-induced torsional response in tall buildings, demonstrating that skyscraper motion is three-dimensional rather than simply a building leaning back and forth.
Vortex Shedding: Why Wind Can Make a Tower Oscillate Sideways
Imagine wind approaching a rectangular tower.
Air cannot pass directly through it.
The flow separates around the sides.
Behind the building, rotating regions of air called vortices can form and detach alternately from opposite sides.
This is vortex shedding.
When one vortex forms and separates, it changes pressure around the tower.
Then another forms on the opposite side.
The changing pressure can push the building:
left,
right,
left,
right.
If those aerodynamic forces become organized, the resulting skyscraper sway can become much stronger than engineers want.
The problem becomes especially important when the frequency of the wind-induced forcing approaches one of the building’s natural vibration frequencies.
That creates the possibility of resonance.
Every Skyscraper Has a Natural Frequency
Push a playground swing and release it.
It oscillates at a preferred rhythm.
Strike a tuning fork and it vibrates at a characteristic frequency.
Buildings behave similarly.
Every structure has natural modes of vibration.
A skyscraper may have a fundamental side-to-side mode plus higher-order bending and twisting modes.
The taller and more flexible the structure, the longer its fundamental period often becomes.
If repeated aerodynamic forces arrive with a rhythm close to one of these natural modes, motion can build.
That does not mean the building instantly collapses.
Engineers deliberately calculate these frequencies and examine how wind interacts with them.
NIST’s work on tall flexible structures emphasizes the importance of natural frequencies and damping when calculating wind response. NIST’s wind-load research shows why dynamic behavior matters more for flexible high-rises than for ordinary rigid buildings.
Managing skyscraper sway therefore requires both structural engineering and aerodynamics.
Engineers Actually Test Tiny Skyscrapers in Wind Tunnels
Before some major towers are built, engineers create highly detailed scale models.
They then expose those models to simulated wind.
The surrounding city may also be modeled because nearby towers can:
block wind,
redirect it,
accelerate it through gaps,
or create turbulence.
Pressure sensors measure how the wind behaves across different surfaces.
Engineers rotate the model to test different wind directions.
They combine this information with historical wind climate data for the real site.
Wind-tunnel testing for skyscrapers is not a new idea.
NIST documents how engineers tested a scale model of the Empire State Building in a wind tunnel in 1931, measuring pressures at numerous points and wind directions. NIST’s history of tall-building wind-tunnel testing shows how these experiments helped establish methods still developed today.
Modern testing is vastly more sophisticated.
Computer modeling supplements it, but physical wind tunnels remain extremely valuable because turbulent air around complex building shapes is difficult to reproduce perfectly.
The atmosphere itself is a complex fluid system. The News Ink’s NASA Earth Science guide explains how scientists study winds, storms and atmospheric circulation on a planetary scale; skyscraper wind engineers deal with those same physical processes at the scale of individual cities and buildings.
Why Engineers Do Not Simply Add More Steel and Concrete
The obvious solution to skyscraper sway seems straightforward:
Make the building stronger.
Add more concrete.
Use larger steel columns.
Make everything thicker.
That can work—but only to a point.
Strength and stiffness are not exactly the same thing.
A structure can be strong enough not to fail yet flexible enough to move noticeably.
Increasing stiffness also adds:
weight,
material cost,
foundation loads,
embodied carbon,
construction complexity,
and usable-space penalties.
At extreme heights, simply adding structure becomes inefficient.
Modern skyscraper engineering therefore attacks wind from several directions simultaneously:
- make the structural system sufficiently stiff;
- shape the building to reduce aerodynamic forces;
- add damping to absorb motion;
- design for human comfort as well as structural safety.
This combination is much smarter than attempting to create a gigantic immovable block.
The Building’s Shape Can “Confuse the Wind”
One of the most elegant ways to reduce skyscraper sway is changing the shape of the skyscraper itself.
Sharp rectangular towers can develop highly organized vortex shedding.
Change the geometry and the vortices become less coordinated.
Engineers use:
tapering,
setbacks,
rounded corners,
cut corners,
openings,
twisting forms,
changes in width,
and irregular façades.
Research published through the Council on Tall Buildings and Urban Habitat shows that rounded corners, tapering and other aerodynamic modifications can disrupt coherent vortex formation and reduce across-wind response. CTBUH research on aerodynamic tall-building configurations explains how these forms change the wake behind a building.
Sometimes what looks like dramatic architecture is actually engineering.
Burj Khalifa Literally Changes Shape to Defeat the Wind
Burj Khalifa in Dubai rises 828 meters above the ground.
At that scale, wind is one of the central design problems.
The tower uses a Y-shaped floor plan and a structural system called a buttressed core.
Three wings support a strong central core.
But the aerodynamic strategy is equally important.
As Burj Khalifa rises, its wings repeatedly step backward.
Its dimensions therefore keep changing with height.
SOM, the tower’s architect and structural engineer, describes the strategy as effectively “confusing the wind.”
Because the tower’s shape changes from one height to another, organized vortices struggle to remain synchronized over the full building.
The SOM engineering explanation of Burj Khalifa describes how the Y-shaped plan, setbacks and changing widths reduce wind forces.
The official Burj Khalifa site also states that engineers conducted more than 40 wind-tunnel tests covering the tower, local wind climate and even construction cranes. Burj Khalifa’s official design history documents the scale of that testing.
The result is not a tower that never moves.
It is a tower designed so skyscraper sway remains controlled.
Modern megaprojects continue pushing these engineering limits. The News Ink’s coverage of Saudi Arabia’s Vision 2030 megaprojects shows just how ambitious contemporary large-scale urban construction has become.
Taipei 101 Uses a 728-Ton Moving Ball
Perhaps the most visible example of motion control is inside Taipei 101.
High inside the tower hangs an enormous steel sphere.
It weighs 728 tons.
This is a tuned mass damper, or TMD.
When wind pushes the tower in one direction, the giant suspended mass tends to move relative to the building.
Its movement is tuned so that it counteracts part of the building’s oscillation.
Energy that would otherwise become noticeable skyscraper sway is instead absorbed and dissipated through the damping system.
The Council on Tall Buildings and Urban Habitat’s Skyscraper Center profile of Taipei 101 confirms that the 728-ton damper is positioned near the top specifically to offset lateral movement caused by strong winds.
Why place it high in the building?
Because displacement from bending tends to become greatest near the top.
That gives the damper maximum leverage against the motion occupants are most likely to notice.
A Tuned Mass Damper Is Like a Counterweight for Motion
Imagine holding a flexible ruler upright and moving the bottom.
The top swings significantly.
Now imagine attaching a carefully controlled weight near the upper portion.
If that mass moves with the correct timing, it can reduce the ruler’s oscillation.
A skyscraper damper follows the same basic principle on an enormous scale.
But there is more engineering involved than simply hanging something heavy.
Engineers tune:
mass,
stiffness,
motion frequency,
damping,
and connection systems
to the specific dynamic behavior of the building.
Different towers use different technologies.
Possible systems include:
tuned mass dampers,
tuned liquid dampers,
viscous dampers,
friction dampers,
active control systems,
and combinations of several methods.
The objective is always similar:
reduce unwanted skyscraper sway by removing energy from the oscillation.
Shanghai Tower Uses Both Shape and Damping
Shanghai Tower demonstrates what happens when aerodynamic architecture and mechanical damping work together.
The 128-story tower has a distinctive twisting exterior.
That is not purely decorative.
Wind engineers optimized the tower’s form to reduce wind-induced forces.
RWDI, which worked on the tower’s wind engineering, says extensive wind-tunnel testing and aerodynamic optimization controlled most of the movement, while a tuned mass damper provided additional motion control for occupant comfort. RWDI’s Shanghai Tower case study explains that the system makes movement near the tower’s top difficult for most occupants to detect.
This illustrates an important principle.
The best way to manage skyscraper sway is often not one giant solution.
It is several smaller strategies working together.
Safety Is Not the Only Problem—People Must Feel Comfortable
A skyscraper can be structurally safe and still be unpleasant to occupy.
Humans are surprisingly sensitive to slow building motion.
People near the top may experience:
dizziness,
nausea,
anxiety,
visual discomfort,
or a sensation that the horizon is moving.
A tower could theoretically remain far below its structural failure limit while occupants are already complaining.
That is why engineers distinguish between:
strength and safety
and
serviceability and habitability.
ASCE’s publication on wind-induced motion and occupant habitability notes that wind motion in tall buildings can cause nausea, dizziness, anxiety and other forms of discomfort.
So modern skyscraper sway limits are often governed not only by whether the tower survives but by whether the people inside can comfortably work, sleep or eat.
This becomes especially important in:
luxury apartments,
hotels,
observation decks,
and high-rise offices.
People do not want to spend millions on a top-floor apartment that makes them feel seasick whenever a storm arrives.
Displacement and Acceleration Are Different
When people hear that a skyscraper can move, they usually ask:
How many centimeters does the top move?
That is useful information.
But human comfort often depends strongly on acceleration.
Imagine two rides.
One moves slowly several centimeters from side to side.
The other moves only a small distance but changes direction sharply.
The second can feel much more uncomfortable.
The same principle applies to skyscraper sway.
Engineers therefore calculate:
maximum displacement,
acceleration,
vibration frequency,
duration,
and direction of motion.
A building can move a measurable distance yet feel relatively calm if the movement is slow and smooth.
Conversely, smaller rapid motion can become noticeable.
This is why saying “this tower moves one meter” without explaining the wind event, height, frequency and acceleration can be misleading.
Skyscrapers Are Designed to Return Toward Their Original Position
Controlled movement does not mean permanent deformation.
Under ordinary wind loading, structural elements remain primarily within their elastic range.
Think of a spring.
Push it.
It moves.
Remove the force.
It returns.
Concrete cores, structural steel and composite systems are engineered so expected winds can cause deformation without leaving the tower permanently leaning.
Very extreme conditions involve more complicated design requirements, but ordinary skyscraper sway is fundamentally elastic behavior.
That is why watching a tower move during a storm does not mean it is slowly bending out of shape.
Movement is part of how it was designed to behave.
Wind and Earthquakes Move Buildings Differently
Tall buildings are also designed for earthquakes in seismic regions.
But earthquake forces and wind forces are not identical.
Wind primarily pushes against the building’s exterior over time.
An earthquake moves the ground beneath the building.
The tower’s mass then develops inertial forces as the foundation moves.
A structural system may therefore require different strategies for each hazard.
Taipei 101 is an especially interesting case because Taiwan experiences both typhoons and significant earthquakes.
Structural resilience during earthquakes is a much broader subject. The News Ink’s coverage of the 2026 Indonesia earthquake explains why construction quality, structural systems and local ground conditions can strongly influence how buildings perform during intense shaking.
Both hazards demonstrate the same fundamental lesson:
A building does not become safe by refusing to move.
It becomes safe when engineers understand how it will move.
Could a Skyscraper Sway Too Much?
Yes.
Controlled skyscraper sway is desirable.
Excessive movement is not.
Too much deformation could create problems involving:
structural members,
glass façades,
interior walls,
pipes,
electrical systems,
elevator equipment,
doors,
connections,
and occupant comfort.
Engineers therefore establish allowable limits.
The building’s structural system is designed to resist expected extreme winds with appropriate margins.
Then wind-tunnel data and dynamic analysis help engineers determine whether movement remains acceptable.
If not, designers can:
increase stiffness,
modify the tower’s shape,
increase structural damping,
install a mass damper,
or combine several solutions.
Design often becomes iterative.
Change the shape.
Test it.
Analyze it.
Modify it again.
That process continues until architecture, structural efficiency and wind performance work together.
Why Do Skyscrapers Sometimes Creak in Wind?
Buildings contain thousands of components.
Structural frames move slightly.
Curtain walls move relative to floors.
Interior partitions flex.
Mechanical connections experience small changes in load.
As skyscraper sway occurs, components can produce noises.
A sound does not automatically indicate structural danger.
Many systems intentionally use joints and connections capable of accommodating movement.
Problems arise when movement exceeds what components were designed to tolerate.
This is another reason engineers do not study only the main concrete core or steel frame.
The entire building must accommodate motion.
Do Windows Have to Move Too?
Yes—indirectly.
A glass façade cannot simply be attached to a flexible tower as though both were perfectly motionless.
Curtain-wall systems require joints, gaskets and connections capable of accommodating:
building drift,
thermal expansion,
floor movement,
wind pressure,
and construction tolerances.
If the structure moves but the façade cannot, glass or connections could be damaged.
The same is true for many building systems.
Modern skyscraper sway must be considered by:
structural engineers,
façade engineers,
elevator designers,
mechanical engineers,
architects,
and wind specialists.
A supertall building is therefore less like one giant object and more like thousands of systems designed to move together.
Why Very Skinny Skyscrapers Are Especially Challenging
A tower that is tall and broad is generally easier to stiffen than one that is extremely tall and narrow.
Modern cities have increasingly built slender residential towers on small parcels of expensive land.
As slenderness increases, wind-induced movement can become one of the dominant design challenges.
The tower may remain more than strong enough against collapse while still moving too much for occupants.
This is why some extremely slender towers require sophisticated damping systems.
In these buildings, occupant comfort can become one of the factors that determines the entire structural design.
Could Climate Change Affect Skyscraper Wind Design?
Building codes already require engineers to consider severe wind events appropriate to local climate and risk.
Future climate conditions add another layer of complexity because storm behavior and extreme weather risks may change differently across regions.
It would be inaccurate to claim that every city will simply experience stronger winds.
Climate effects vary geographically and by storm type.
But infrastructure intended to operate for many decades increasingly has to be considered within broader resilience planning.
The News Ink’s Climate Change Explained guide examines how changing heat, storms, flooding and other hazards influence cities and infrastructure.
For skyscraper engineers, long service lives make conservative understanding of local wind climate especially important.
Why Not Build Skyscrapers Like Solid Pyramids?
Structurally, very wide buildings are easier to stabilize.
But cities do not build purely for structural convenience.
Land is expensive.
People want:
usable floor space,
views,
daylight,
efficient elevators,
offices,
apartments,
hotels,
and attractive architecture.
A gigantic solid pyramid would consume enormous land and material.
The goal of tall-building engineering is therefore not simply:
Build the stiffest object possible.
It is:
Build the most efficient structure that safely satisfies its architectural and human requirements.
Controlled skyscraper sway is part of that optimization.
Does a Taller Skyscraper Always Sway More?
Not necessarily.
Height strongly matters, but it is not the only variable.
Skyscraper sway depends on:
height,
width,
shape,
structural system,
mass,
material,
natural frequency,
damping,
surrounding buildings,
local wind climate,
and wind direction.
A shorter, extremely slender building could have serious motion challenges.
A taller but broader and aerodynamically optimized tower may perform better.
That is why engineering comparisons based only on height are incomplete.
Could You See a Skyscraper Moving From the Street?
Usually not during ordinary conditions.
The motion is typically small relative to the enormous size of the tower.
A few centimeters or even larger movements near the top become visually tiny when viewed from hundreds of meters away.
Inside, sensitive occupants may notice motion before an observer on the ground sees anything.
Mechanical dampers can make movement more obvious because a visitor can sometimes see the mass moving relative to the building itself.
Taipei 101 famously displays its giant damper rather than hiding it completely, turning a structural engineering device into an attraction.
Is Skyscraper Sway Dangerous?
Normally, no.
A properly designed tower is expected to move.
The dangerous situation would be movement beyond what the structural and nonstructural systems were designed to accommodate.
Modern skyscrapers undergo extensive analysis before construction.
Engineers consider combinations of:
wind speed,
direction,
gustiness,
building shape,
structural response,
dynamic amplification,
material behavior,
and safety factors.
NIST’s modern database-assisted design research shows how advanced tall-building design increasingly combines detailed pressure data, local wind climates and time-domain structural analysis.
The existence of motion itself is therefore not a warning sign.
Uncontrolled motion would be.
Frequently Asked Questions
Why do skyscrapers sway?
Skyscraper sway occurs because wind applies changing horizontal and torsional forces to tall, flexible structures. Engineers intentionally allow limited elastic movement rather than trying to make a tower perfectly rigid.
Are skyscrapers supposed to move in wind?
Yes. Controlled movement is normal. Engineers design the structure so expected skyscraper sway remains within safety and comfort limits.
Why not make skyscrapers completely rigid?
Making a supertall tower almost perfectly rigid would require enormous quantities of structural material and could be inefficient. Controlled flexibility allows forces to be managed more economically.
What is vortex shedding?
Vortex shedding occurs when alternating rotating regions of air form and separate behind a building. These changing pressures can produce side-to-side skyscraper sway.
What is a tuned mass damper?
A tuned mass damper is a large mass designed to move relative to the building in a way that reduces structural oscillation.
How heavy is the Taipei 101 damper?
The Skyscraper Center lists Taipei 101’s tuned mass damper at 728 tons. It is installed high inside the tower to counter lateral motion caused by strong winds.
Does Burj Khalifa sway?
Like other extremely tall buildings, Burj Khalifa is designed to experience controlled movement. Its Y-shaped plan, setbacks and changing geometry reduce organized wind forces and help limit skyscraper sway.
Can people feel skyscrapers moving?
Sometimes. Occupants near the top are most likely to detect motion, particularly during strong wind. Excessive acceleration can cause discomfort even when the structure remains safe.
Are skyscrapers safer if they move?
Movement itself is neither automatically safer nor more dangerous. The key is controlled flexibility. Engineers design the tower to deform predictably while remaining within acceptable structural and comfort limits.
Do earthquakes make skyscrapers sway too?
Yes, but through a different mechanism. Wind applies aerodynamic loads to the tower, while earthquakes move the building’s foundation and generate inertial forces throughout the structure.
Skyscraper Sway Is a Feature, Not a Failure
Looking at a skyscraper, it is easy to imagine strength as absolute rigidity.
Concrete looks solid.
Steel looks rigid.
The tower appears motionless.
But engineering tells a different story.
The tallest buildings on Earth survive precisely because engineers expect them to move.
Wind pushes against their façades.
Gusts change pressure.
Vortices form.
The structure bends.
Energy enters the building.
Then structural stiffness and damping control what happens next.
Burj Khalifa changes shape repeatedly as it climbs into the sky, preventing wind vortices from becoming strongly organized.
Taipei 101 uses a 728-ton moving mass to counteract unwanted motion.
Shanghai Tower combines aerodynamic twisting with damping technology.
These solutions exist because skyscraper sway cannot simply be ignored.
But neither should it be feared.
A skyscraper is not a rigid monument resisting every force through brute strength.
It is a dynamic engineering system.
Its concrete core, steel frame, façade, dampers and aerodynamic shape work together to handle energy.
That is also why engineers study comfort alongside structural strength.
A tower could be nowhere near collapse and still move enough to make people uncomfortable.
Successful design therefore has two goals:
keep the building safe
and
make the people inside feel safe and comfortable.
This is the key to understanding skyscraper sway.
Modern towers are designed to move because controlled flexibility is often more efficient than impossible rigidity.
The motion is calculated.
The wind is tested.
Natural frequencies are analyzed.
Damping is added where necessary.
Every major system is designed to accommodate the movement.
So the next time strong winds cause the upper floors of a skyscraper to shift slightly, remember what is actually happening.
The building is not necessarily struggling against the storm.
It is doing exactly what its engineers designed it to do.
It bends.
It absorbs.
It dissipates.
And then it moves back.
That controlled skyscraper sway is one of the reasons structures hundreds of meters tall can stand safely in some of the strongest winds cities experience.
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